Packages by isaacs
walden
WHEN I WROTE the following pages, or rather the bulk of them, I lived alone, in the woods, a mile from any neighbor, in a house which I had built myself, on the shore of Walden Pond, in Concord, Massachusetts, and earned my living by the labor of my hands
own-or-env
Use an objects own property, or an environment variable. Optionally treat as a boolean if the env should be set to 1 or 0.
bind-obj-methods
Bind methods to an object from that object or some other source. Optionally specify a set of methods to skip over.
function-loop
Run a list of functions in order in a given object context. The functions can be callback-taking or promise-returning.
fs-readstream-seek
A [fs.ReadStream](https://nodejs.org/api/fs.html#fs_class_fs_readstream) that supports seeking to arbtrary locations within a file.
ghlink
Turn stuff like `isaacs/npm#1234` into `https://github.com/isaacs/npm/issues/1234`, for your hyperlinking pleasure.
hardhttps
Make an https server that is more resistant to client-initiated renegotiations, and other common security mistakes.
error-page
Easily send errors in Node.js HTTP servers. Think like the `ErrorDocument` declarations in Apache config files.
pingme
Super simple HTTP server that can be easily pinged so that Nagios et al can know your stuff's healthy.
lockfile
A very polite lock file utility, which endeavors to not litter, and to wait patiently for others.
spawn-wrap
Wrap all spawned Node.js child processes by adding environs and arguments ahead of the main JavaScript file argument.
npm-tips
A collection of short (5 words or so) tips and tricks that can be sprinkled about the npm site.
pseudomap
A thing that is a lot like ES6 `Map`, but without iterators, for use in environments where `for..of` syntax and `Map` are not available.
npm-marketing-sidebar-blob
The blobs of marketing goodness that go in the sidebar of https://www.npmjs.com/
gatsby-remark-tumble-media
A gatsby plugin to do tumble blog style media embeds, like photosets, videos, and links.
minipass-sized
A Minipass stream that raises an error if you get a different number of bytes than expected
json-stringify-nice
Stringify an object sorting scalars before objects, and defaulting to 2-space indent
diff-frag
Take a big diff with a 2-line header and turn it into frags with only a reasonable amount of context
@isaacs/testing-peer-deps-d
depends on a v2, which has a peer dep on b v2, which has a peer dep on c
@isaacs/testing-peer-deps
depends on b, which has a peer dep on c, and d, which has a regular dep on a, which has a peer dep on b which has a peer dep on c
@isaacs/testing-optional-dep-metadata-missing
a package with an optional dependency on a package that does not exist
@isaacs/testing-optional-dep-tgz-missing
a package with an optional dependency on a package whose tarball does not exist
@isaacs/testing-prod-dep-tgz-missing
a package with an optional dependency on a package whose tarball does not exist
@isaacs/testing-prod-dep-metadata-missing
a package with an prod dependency on a package that does not exist
mkdirp-infer-owner
mkdirp, but chown to the owner of the containing folder if possible and necessary
promise-call-limit
Call an array of promise-returning functions, restricting concurrency to a specified limit.
@isaacs/nested-yarn-lock-test
This is an example case showing that a `yarn.lock` file does not guarantee package resolutions at all levels.
@isaacs/testing-rebuild-bundle
- `root` depends on `parent` - `parent` bundles `a` - `a` depends on `b` - `b` has a build script
test-root-matches-metadep
When a root node matches a metadep being added to the tree, the loop-detection link deduplication made in a lot of problems as a result of the link going to the root node from the /virtual-tree temp tree, ultimately resulting in the root node being reifie
@isaacs/testing-peer-dep-conflict-chain-e
A chain of peer deps. Installing v1 of any of them requires v1 of all of them. v2 of any requires v2 of all. No v1 can coexist with any v2.
@isaacs/testing-peer-dep-conflict-chain-override
a peer dep that is overridden by the root dependency
@isaacs/testing-peer-dep-conflict-chain-override-peer
a peer dep that is overridden by the root dependency
retry-until
Just a way to keep calling a function as long as it's throwing, for some period of time.
@isaacs/testing-peer-optional-conflict-a
``` root -> (x, y@1) x -> PEEROPTIONAL(z) z -> PEER(y@2) ```
@isaacs/testing-peer-optional-conflict-b
``` root -> (x) PEEROPTIONAL(y@1) x -> PEEROPTIONAL(y@2) ```
@isaacs/testing-peer-optional-conflict-c
``` root -> (x) PEEROPTIONAL(y@1) x -> PEER(z) z -> PEEROPTIONAL(y@2) ```
@isaacs/testing-peer-optional-conflict-d
``` root -> (x, z@1) x -> PEEROPTIONAL(y) y -> PEER(z@2) ```
@isaacs/testing-peer-optional-conflict-e
``` root -> (x, z@1) x -> PEEROPTIONAL(y) PEER(z@1) y -> PEER(z@2) ```
@isaacs/testing-peer-optional-conflict-f
``` root -> (x, z@1) x -> PEEROPTIONAL(y) PEER(z@1) PEER(w@1) w -> PEER(z@1) y -> PEER(z@2) ```
@isaacs/npx-find-files
Example of how to find actual location of the bin in a npm package if the bin is a bash script.
@isaacs/string-locale-compare
Compare strings with Intl.Collator if available, falling back to String.localeCompare otherwise
@tier.run/cli-linux-amd64
This package includes the pre-compiled tier binary, and an index.js which reports the full path to the compiled binary.
@tier.run/cli-linux-arm64
This package includes the pre-compiled tier binary, and an index.js which reports the full path to the compiled binary.
@tier.run/cli-darwin-amd64
This package includes the pre-compiled tier binary, and an index.js which reports the full path to the compiled binary.
@tier.run/cli-darwin-arm64
This package includes the pre-compiled tier binary, and an index.js which reports the full path to the compiled binary.
@tier.run/cli-windows-amd64
This package includes the pre-compiled tier binary, and an index.js which reports the full path to the compiled binary.
@tier.run/cli-windows-arm64
This package includes the pre-compiled tier binary, and an index.js which reports the full path to the compiled binary.
@isaacs/ttlcache
The time-based use-recency-unaware cousin of [`lru-cache`](http://npm.im/lru-cache)
actual-request-url
Get the best guess as to what url the user actually requested, based on what the `Forwarded`, `X-Forwarded-*`, `X-Forwarded-For`, ..., request headers are trying to tell you.
@isaacs/hot-module-reload
Gracefully reload your modules when they change. Only works with CJS, not ESM. Uses stat polling.
@isaacs/express-prometheus-middleware
RED/USE metrics for express applications (forked to remove vulnerable optional deps)
sync-content
Synchronize the contents of one folder to another location, only copying files if contents differ.
resolve-import
Look up the file that an `import()` statement will resolve to, possibly relative to a given parentURL
@tapjs/asserts
Tap plugin that adds a heaping pile of assertion methods. Pretty much all of the "test" methods other than `t.pass`, `t.fail`, and [snapshot methods](https://tapjs.github.io/tapjs/modules/_tapjs_snapshot.html) come from this plugin.
@tapjs/esbuild-kit
Alternative to @tapjs/typescript. Load typescript using @esbuild-kit/cjs-loader and @esbuild-kit/esm-loader instead of ts-node.
@tapjs/mocha-globals
An optional plugin adding Mocha-like BDD and TDD interfaces to the global environment when tap is loaded.
@isaacs/ts-node-temp-fork-for-pr-2009
TypeScript execution environment and REPL for node.js, with source map support
socket-post-message
Do the `postMessage()`/`on('message')` thing with any arbitrary socket (really, any stream) in Node.js.
sock-daemon
A utility for creating a daemon process that listens on a socket, and a client that talks to it.
@isaacs/cached
Cache a function that takes a path as an argument, expiring whenever the file mtime changes
treeverse
Walk any kind of tree structure depth- or breadth-first. Supports promises and advanced map-reduce operations with a very small API.
minizlib
A small fast zlib stream built on [minipass](http://npm.im/minipass) and Node.js's zlib binding.
@isaacs/promise-tracker
This is a way to track the results of a promise, without obscuring `unhandledrejection` events, or losing other added properties that may exist on the promise being tracked.
gravitationism-calendar
A bit of JavaScript to create the [Gravitationism](https://blog.izs.me/2025/10/church-of-gravitationism/) [Solar](https://izs.me/solar-events.ics) and [Lunar](https://izs.me/months.ics) calendars.
